Home Depot has some metric bolts avaiable hopefully one of the other members can give you the size and of course the dealer should have them.
You said that the bolts were striped did they have nuts on the other end or were do they threaded into the control arm. If they thread into the control arm you need to take a good look at the threads there as they could be rusted out or striped also.

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84 300D, 82 Volvo 244Gl Diesel